/Engine/Source/Runtime/OpenGLDrv/Public/OpenGLResources.h
FOpenGLViewport ( class [FOpenGLDynamicRHI](API\Runtime\OpenGLDrv\FOpenGLDynamicRHI) * InOpenGLRHI, void * InWindowHandle, uint32 InSizeX, uint32 InSizeY, bool bInIsFullscreen, EPixelFormat PreferredPixelFormat )